Backdrive control system for aircraft flight control surfaces
US4991800A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 14, 1988 |
| Grant date | Feb 12, 1991 |
| Priority date | — |
| Expiry date | Nov 14, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB64C13/44
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A backdrive system is provided for aircraft flight control surfaces, including a motor for driving a control surface. A fluid pressure responsive engaging/disengaging device is operatively associated between the motor and the control surface. The device may be a clutch normally engaged in the absence of to supply pressure or a brake normally disengaged in response to supply pressure. A supply of fluid pressure is connected to the device. An accumulator is connected in-line between the fluid pressure supply and the engaging/disengaging device for storing hydraulic energy during normal operation of the system and for releasing the stored hydraulic energy for at least a given period of time in the event of loss of supply pressure to allow the control surface to backdrive to a neutral position. A check-valve is provided between the fluid pressure supply and the accumulator to prevent return of hydraulic energy from the accumulator supply of fluid pressure when the supply pressure is lost. A bleed path is provided from the engaging/disengaging device to provide a time delay until the device is reengaged to lock up the control surface and prevent surface flutter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.